code: def setUp(self):
      self.batch_size = 5
      self.diag = numpy.random.uniform(
          0.1, 1, (self.batch_size, self.n)
      ).astype(numpy.float32)
      non_diag_size = self.n * (self.n - 1) // 2
      self.non_diag = numpy.random.uniform(
          -1, 1, (self.batch_size, non_diag_size)
      ).astype(numpy.float32)
      self.gy = numpy.random.uniform(
          -1, 1, (self.batch_size, self.n, self.n)
      ).astype(numpy.float32)
  
file_path: chainerrl/tests/functions_tests/test_lower_triangular_matrix.py
imports: import unittest
  import numpy
  import chainer
  from chainer import cuda
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
  from chainerrl.functions.lower_triangular_matrix import lower_triangular_matrix
  from chainerrl.functions.lower_triangular_matrix import LowerTriangularMatrix
label_desc: Use image node_id 1 for calling the TestLowerTriangularMatrix obj's underlying member method code with example usage: obj.setUp() without return types